of the wright brothers, google co-founder and california governor jerry brown cruised up to google headquarters to make it official. the self-driving car is now street legal in california. >> but it really has the power to change people's lives. that's why i'm really excited about it. >> google has been testing the self-driving cars for 300,000 miles and says they're safer than human drivers. it'll still be a while before you or i can go buy one, but so much progress has been made over the last few years, brinn says these cars are on their way to regulation status. >> self-driving cars can make a transformative difference, which is really enabling huge classes of people who were previously effectively trapped or very hampered in their ability to get around the world. >> reporter: they're potentially energy and time-saving, letting people get things done. >> that's the essence, i understand, of google, being able to imagine what isn't and bringing it to reality. so today we're looking at science fiction becoming tomorrow's reality. the self-driving car. >> reporter: but even before it gets the g